What do time-oriented policies and time offices bring to urban planning ? Introduced in France in the late 1990s, the originality and interest of their actions lie on their choice to integrate the plurality of urban rhythms in planning. The consideration of this plurality takes three directions : the multiplicity of social time, the polychrony of the places and the sequential versatility of spaces. However, time-oriented policies lack resources and recognition. In this way, their actions lack global scopes. [...]